Oilpan: IDBCursor should be detached from IDBRequest when the IDBRequest stops

Source/modules/indexeddb/IDBRequest.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 95 matching lines @@
     virtual void onSuccess(PassRefPtr<IDBKey>, PassRefPtr<IDBKey> primaryKey, PassRefPtr<SharedBuffer>);
 
     // Only IDBOpenDBRequest instances should receive these:
     virtual void onBlocked(int64_t oldVersion) { ASSERT_NOT_REACHED(); }
     virtual void onUpgradeNeeded(int64_t oldVersion, PassOwnPtr<blink::WebIDBDatabase>, const IDBDatabaseMetadata&, blink::WebIDBDataLoss, String dataLossMessage) { ASSERT_NOT_REACHED(); }
     virtual void onSuccess(PassOwnPtr<blink::WebIDBDatabase>, const IDBDatabaseMetadata&) { ASSERT_NOT_REACHED(); }
 
     // ActiveDOMObject
     virtual bool hasPendingActivity() const OVERRIDE FINAL;
     virtual void stop() OVERRIDE FINAL;
+    virtual void contextWillBeDestroyed() OVERRIDE FINAL;
 
     // EventTarget
     virtual const AtomicString& interfaceName() const OVERRIDE;
     virtual ExecutionContext* executionContext() const OVERRIDE FINAL;
     virtual void uncaughtExceptionInEventHandler() OVERRIDE FINAL;
 
     using EventTarget::dispatchEvent;
     virtual bool dispatchEvent(PassRefPtr<Event>) OVERRIDE;
 
     // Called by a version change transaction that has finished to set this
@@ skipping 49 matching lines @@
     bool m_didFireUpgradeNeededEvent;
     bool m_preventPropagation;
     bool m_resultDirty;
 
     DOMRequestState m_requestState;
 };
 
 } // namespace WebCore
 
 #endif // IDBRequest_h